Thermal-radiation light source and two-dimensional photonic crystal used therein
|発明の名称 （英語）||Thermal-radiation light source and two-dimensional photonic crystal used therein|
|発明の概要（英語）||This invention provides a thermal-radiation light source that allows light-intensity changes with a response speed on par with photoelectric conversion elements. Said thermal-radiation light source (10) is provided with a two-dimensional photonic crystal (12) in which an n layer (112) comprising an n-type semiconductor, a quantum-well-structure layer (114) that has a quantum-well structure, and a p layer (111) comprising a p-type semiconductor are stacked in that order to form a plate (11) inside which different-refractive-index regions (holes (121)), each of which has a refractive index that is different from those of the n layer (112), the p layer (111), and the quantum-well-structure layer (114), are laid out in a periodic manner so as to resonate with light of a specific wavelength corresponding to the transition energy between subbands in the quantum wells in the quantum-well-structure layer (114). This thermal-radiation light source (10) is also provided with a p-type electrode (131) and an n-type electrode (132) for applying, to the abovementioned plate (11), a voltage that is negative on the side corresponding to the p layer (111) and positive on the side corresponding to the n layer (112).|
The heat radiating light source has the following advantages: providing heat to the object only can be obtained a light-emitting. The heat radiation source such as the waste heat is converted into the engine can be used as a means for sensing infrared rays to be suitably used in the analysis for components of the engine in the exhaust gas in the gas sensor. In addition, the heat radiating light source is not limited to use as a gas sensor of the light source, can also be used to detect human, vehicle, animal or the like such as an incoming sensor using the infrared light source of a variety of sensor.
Is provided a hot item of the electromagnetic wave emitted from the wavelength range of the spanned spectrum. For example the object through heat to several tens of °C-wavelength of the electromagnetic wave ranging from a few hundred °C µm-tens of µm. However, in the aforementioned infrared sensor typically utilize only a specific wavelength of infrared ray, therefore when used with such heat-radiation light source, other than the specific wavelength is to be measured may be creation of the object to be measured without adverse effect such as infrared heat. In addition, in the case of thermal radiation through the access power to creation, if the creation of the radiation over a wide band light source, then power consumption increase will become a problem.
In order to solve such a problem, in Non-Patent Document 1 proposes a thermal radiation light source, the heat radiating light source having a board and the modified refractive index region, said sheet having a quantum well structure will be described later, the modified refractive index areas arranged periodically in the within the sheet, and the refractive index of the sheet material having different refractive indices. A quantum well structure refers to the following structure: through a variety of different sizes of the band gap of a thickness of several nm-about ten and several nm of the semiconductor layer are laminated, to form a square well energy potential (quantum well). In addition, in the modified refractive index areas arranged periodically through the sheet material, to form a periodic distribution of refractive index. This range is formed in a periodic refractive index distribution in a plate is referred to as "two-dimensional photonic crystal" of the object. It is known that, in a two-dimensional photonic crystal is formed with a refractive index distribution of the light of a specific wavelength corresponding to the period of the standing wave, whereby the light of a specific wavelength that is resonant.
In the light source heat radiation of the Non-Patent Document 1, when the supply of heat from a heat source, the energy band within the formation of the quantum-well (and the semiconductor strip which is referred to as "sub-band" to distinguish) takes place between the energy transition, as a result, the wavelength of light generated by the specific wavelength range. Furthermore, this range of wavelengths of light having a wavelength of a photonic crystal of the particular period of the light in the photonic crystal resonance. As a result, Non-Patent Document 1 has the heat radiation from the light source can be generated at the specific wavelength light of the wavelength spectrum has a sharp peak.
Non-Patent Document 1: De Zoysa Menaka (DS Cable ) et al., "Conversion of broadband to narrow band thermal emission through energy recycling" (based on the energy recovered from the wide-band conversion of heat to the narrow-band thermal radiation 8 July), Nature Photonics,(British), Nature Publishing Group,2012 years, 6th roll, 535-539 page
1. A thermal radiation light source, characterized in, is provided with:
A) a two-dimensional photonic crystal, n-type semiconductor formed by n in the layer, a quantum well structure having quantum well structure and p-type semiconductor layer is formed of a p layer in this Order along with the thickness direction within the sheet is formed by laminating, on a periodic basis and the refractive index n layer is disposed, and a quantum well structure layer having a refractive index different from that of p layer modified refractive index region, the quantum well structure with quantum well layers is such that the sub bands in the transition energy of particular wavelengths of light corresponding to between resonate; and
B) electrode, which is negative and n p is applied to the sheet material used for layer-a voltage positive layer side.
2. Thermal radiation light source according to claim 1, characterized in,
A layer of n-type quantum well structure having quantum wells, quantum well structure layer and the p layer in the formed of an insulator is provided between the i layer.
3. Thermal radiation light source according to claim 1, characterized in,
Having a p-type quantum well structure layer quantum wells, quantum well structure in which the n layer formed of an insulator layer and the i layer is provided between.
4. Claim 1-3 according to any one of the heat radiation source, characterized in,
Has the two-dimensional photonic crystal (1/(2 π RC) ) is equal to or larger than the resistance of R and the capacitance C target frequency.
5. Claim 1-4 according to any one of the heat radiation source, characterized in,
Of the p-layer and n layers, the effective mass of carriers having a larger effective mass of carriers in the carrier density than a smaller one of the high carrier density.
6. Claim 1-5 according to any one of the heat radiation source, characterized in,
Of the p electrode and n electrode are made of metallic electrodes made of metal, p electrode and the p contact layer that, of the p-type semiconductor layer forming the p ohmic connection is formed between, said n electrode and the n contact layer, n n-type semiconductor layer forming the connection of the ohmic.
7. Claim 1-6 according to any one of the heat radiation source, characterized in,
At least one of the surfaces of the plate electrode surface so as to surround periodically provided with modified refractive index area is provided so that mounting region.
8. Claim 1-7 according to any one of the heat radiation source, characterized in,
Further comprising an electric power to heat the heating unit through a two-dimensional photonic crystal.
9. A two-dimensional photonic crystal, the heat radiating light source is used, the two-dimensional photonic crystal is characterized by, comprising:
Sheets, the sheets are formed of n-type semiconductor layer by the n, p and quantum well structure having quantum well structure formed of a p-type semiconductor layer by the thickness of the layer is formed by laminating in this Order along direction; and
The modified refractive index region, the refractive index of the modified refractive index region and the n-layer, p layer and a quantum well structure layer having a refractive index different, the modified refractive index areas periodically arranged within the panel, with the quantum well layer in a quantum well structure such that the sub bands in particular wavelengths of light between the transition energy corresponding to resonate.
『 Thermal-radiation light source and two-dimensional photonic crystal used therein 』に関するお問合せ
- 国立研究開発法人科学技術振興機構（ＪＳＴ） 知的財産マネジメント推進部
- URL: http://www.jst.go.jp/chizai/
- Address: 〒102-8666 東京都千代田区四番町5-3
- TEL: 03-5214-8486
- FAX: 03-5214-8417